/Engine/Plugins/Runtime/Metasound/Source/MetasoundFrontend/Public/MetasoundFrontendTransform.h
Return true if InDocument was modified, false otherwise. This function is soft deprecated. It is not pure virtual to grandfather in old transform implementation. Old transforms should be deprecated and rewritten to use the Controller-less API in the interest of better performance and simplicity.
virtual bool Transform ( [FMetasoundFrontendDocument](API\Plugins\MetasoundFrontend\FMetasoundFrontendDocument) & InOutDocument ) const